Problem with ref-attributes and schema validation 2007-06-17 - By Michael Glavassevich
Hi Asgeir,
What you're observing is normal. The prefixes used in schema documents
don't get carried over into the schema component model [1] or defaulted
attributes [2] (just the local name and namespace URI). Note that
sax.Writer is just a sample for users to learn how to use SAX. It doesn't
do everything a real namespace-aware serializer should do like namespace
fixup: selecting suitable prefixes for elements/attributes and adding the
necessary namespace declarations to the document to make it well-formed.
Thanks.
[1] http://www.w3.org/TR/xmlschema-1/#Attribute_Declaration_details
[2] http://www.w3.org/TR/xmlschema-1/#d0e8328
Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@(protected)
E-mail: mrglavas@(protected)
"Asgeir Frimannsson" <asgeirf@(protected)> wrote on 06/14/2007 07:39:47 AM:
> Hi all,
>
> I have come across something that _might_ be a bug in xerces. Let me
> explain by example:
>
> Given the following schema:
>
> <xsd:schema
> xmlns:xsd="http://www.w3.org/2001/XMLSchema"
> xmlns:xml="http://www.w3.org/XML/1998/namespace"
> elementFormDefault="qualified"
> targetNamespace="http://www.example.com">
>
> <!-- Import for xml:space -->
> <xsd:import namespace="http://www.w3.org/XML/1998/namespace"
> schemaLocation="http://www.w3.org/2001/xml.xsd"/>
>
> <xsd:element name="animal">
> <xsd:complexType mixed="true">
> <xsd:attribute ref="xml:space" default="preserve"/>
> <xsd:attribute name="name" type="xsd:string" use="required"/>
> </xsd:complexType>
> </xsd:element>
>
> </xsd:schema>
>
> Notice the xml:space attribute has a default value 'preserve'. Now,
> given the following instance:
>
> <?xml version="1.0" encoding="utf-8"?>
> <animal xmlns="http://www.example.com" xmlns:x="http://www.example.com"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://www.example.com SpaceBug.xsd"
> name="dog">
> hi, i'm a dog
> </animal>
>
> Note that no value is set for xml:space, so I expect xerces to insert
> this for me when doing schema validation. To make the possible bug
> simple to reproduce, I'll use one of the xerces samples for validating
> and writing this document. Using the following options:
> Namespace processing: on
> Namespace prefixes: on
> Validation: on
> Schema validation support: on
> Schema full checking: on
>
> java sax.Writer -n -np -s -f -v instance.xml
>
> ...which produces the following output:
>
> <animal name="dog" space="preserve" xmlns="http://www.example.com"
> xmlns:x="http://www.example.com"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://www.example.com SpaceBug.xsd">
> hi, i'm a dog
> </animal>
>
> Notice how the xml:space attribute is now unqualified. This is
> reproducable for any namespace, not just the special xml namespace.
>
> I initially bumped into this problem when using the XOM library
> (reported [1]), and it seems that the namespace uri is correctly set
> when inserting the default value, but the prefix is lost.
>
> cheers,
> asgeir
>
> [1]
http://lists.ibiblio.org/pipermail/xom-interest/2007-June/003484.html
>
> --
> Asgeir Frimannsson
> PhD Candidate
> School of Software Engineering and Data Communications
> Queensland University of Technology
> 126 Margaret Street, Level 3
> Brisbane QLD 4001, Australia
>
> Phone: (+61) 7 3138 9332 Mob: (+61) 405 412 696
> Email: asgeirf@(protected)
>
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